Re: Cabin pressure at altitude

Date:         03 Feb 97 03:18:34 
From:         "Barry Oliver" <>
Organization: ICONS Software, Inc.
References:   1
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Dale B Rothert <> wrote in article
> I am interested in what the average cabin pressure is in a B-747 or
> similar aircraft at crusing altitued. Presumed crusing is in the mid to
> upper 30's. It would be helpful in inches of mercury but a ratio of
> interior to exterior would serve the purpose.

A rough number is 8.5 PSI differential. The cabin altitude would be at
7,000 to 8,000 feet.